Type-writing machine.



J. A. EDLUND.

TYPE WRITING MAGHINE.

7 APPLICATION FILED ()GT.18,1904.

Patented May 24, 1910.

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UNITED STATES PATENT OFFICE.

JOHN A. EDLUND, 0F SYRACUSE, NEW YORK, ASSIGNOR TO THE MONARCH TYPE- WRITER COMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented May 24, 1910.

To all whom it may concern:

Be it known that I, JOHN A. EDLUND, citizen of the United States, and resident of Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Type- Writing Machines, of which the following is a specification.

This invention relates to type bar bearings of writing machines; and its main object is to provide a simple and efficient ball bearing joint which is dust proof and so narrow that a large number of bars may be mounted in a comparatively small space. Other objects will hereinafter appear.

My invention consists in certain combina tions of devices, features of construction and arrangements of parts all as will be hereinafter more fully set forth and particularly pointed out in the concluding claims.

In the accompanying drawings, Figure 1 is a side elevation of a type bar and hanger mounted upon a segment. Fig. 2 is a fragmentary sectional view of the bearing end of the type bar. Fig. 3 is an enlarged side elevation of the hanger and part of the type bar, parts being broken away for the sake of clearness. Fig. 4 is a sectional view taken on a transverse plane represented by the line m in Fig. 3. Fig. 5 is a view similar to Fig. 3 and showing a modification of my invention. Fig. 6 is a view taken on a transverse plane represented by the line 1 of, Fig. 5.

Considering first Figs. 1 to 4 inclusive, the reference numeral 1 indicates a type bar supporting segment to which is secured a hanger 2 supporting a type bar 3, the latter carrying at its outer end a type block 4:, the types whereon strike against the front face of a platen (not shown) which is supported above the segment 1. The type bar is formed with a perforation 5 for the reception of a connecting link (not shown) by which the bar may be connected to any well known form of mechanism for causing it to swing to the printing point on the platen, from which point a returning spring 6 assists in restoring the bar to normal position. The hanger 2 is preferably made of a flat piece of metal formed with a circular upper portionv 7 and shouldered off at 8 to form a depending shank or stem 9. The shank 9 fits into a slot 10 in the front face of the suporting segment and the hanger is secured 111 place by means of a set screw 11. The

circular portion of the hanger is provided with a cup-like depression or recess 12 of such diameter as to leave a comparatively thin wall or lip 13 at the outer edge of said circular portion. The bottom of the cup like depression 12 has a circular V-shaped groove 14 cut in it near the periphery of the circular portion of the hanger, the said groove forming a seat for a set of anti-friction balls 15. At its pivot end the type bar 3 is considerably cut away or depressed, forming thereby an arc-shaped shoulder 16 concentric with the circular portion 7 of the hanger and of a slightly greater diameter. The depressed part of the type bar conforms substantially in shape and size to the circular part 7 of the hanger and has formed on its inner side two cylindrical bosses, a relatively low boss 17 nearly as great in diameter as the depressed part of the bar and a higher boss 18 of less diameter. The top 19 of the boss 17 forms an annular plane surface, the outer boundary of which is the periphery of the boss 17 and the inner boundary of which is the periphery of the boss 18. The pivot end of the type bar 3 is formed axially with a cylindro-conical perforation or eye 20, which is enlarged at 21 to receive the circular fiat head 22 of a nut 23, the stem or shank 24E whereof enters an axial perforation in the circular part of the hanger. A set of anti-friction balls 23 is interposed between the nut 23 and the eye portion of the type bar. The stem 24 of the nut is tapped to receive a securing screw 25, the head of which enters a countersink in the outer wall of the hanger.

It will be noted that the member 23, which may be regarded as a part of the hanger comprising, with the main part 2, a two-piece hanger, performs several functions; it serves as a pivot for the type bar, as a bearing for the inner set of balls 23, as a means for laterally adjusting and maintaining the relation between the type bar and hanger, while its plate-like head serves as a cover or protecting means for the inner set of balls. It will further be noted that by fitting or seating the type bar in and over one portion of the hanger and by fitting or seating the nut-like member 23 in and over that part of the type bar surrounding the inner set of balls, a construction is obtained by which both sets of balls are well protected from dust and grit and the bearings thereby rendered practically dust proof. By seating or fitting the type bar in and over the hanger the exposed joint between the two parts is broken, that is, the joint is in more than one plane, and so that the plane of the exposed portion (corresponding to the line aa of Fig. 4:) will intersect the type bar before it intersects or is exposed to any of the set of anti-friction balls 23*. The exposed joint is very close, but even if falling particles of dust should penetrate it they are stopped by this arrangement, and, contacting with the periphery of the boss 17, are liable to be throw-n off as the bar swings about its pivot before they can slide over the periphery of said boss and into the cavity containing the outer set of balls. There is no contact at any point between either part of the hanger and type bar in this construction, thus conducingto an easy swing of the bar. Because of this separation, furthermore, the liability of the nut member to unscrew is much less than it would be if the nut member contacted directly with the swinging type bar. As the inner set of balls is in the median plane of the bar, side stress is minimized.

I do. not, of course, desire to. be limited to the specific structure hereinbefore de scribed, and various changes may be made in the construction and arrangements of the parts, some parts may be omitted, other parts added, etc, all without departing from the gist of my invention.

The modification illustrated in Figs. 5 and 6 is an example of some of such changes. In this construction the circular portion 7 of the hanger 2 is formed with a recess or depression 26 considerably less in diameter than that of the corresponding depression in the first construction, thereby leaving a thicker outer wall or rim 27. The top of the rim 27 is provided at its center with a raised circular bearing ring or track-way 28. The type bar 3 is cut away at its bearing end so as to seat or fit into and over the hanger and to bear upon the circular track way 28. The type bar in turn is formed with a cylindrical opening 29 in which is seated a plurality of anti-friction balls 30 and said type bar is further countersunk at 31 to receive the head 32 of the nut-like member 33. The latter is formed with a cone-like bearing portion 34, abutting the balls 30 and is perforated centrally with a hole which is tapped to receive an adjusting screw 35, the head whereof fits into a countersink in the outer wall of the hanger. In this construction as well as in the first construction, a boss or flange on the type bar extends across the exposed joint, forming a bottom to the joint and covering a set of anti-friction balls, In both constructions, also, the pivot nut is loosely connected with the main hanger part, so that if the balls were removed, limited movement between the hanger parts in a direction axial of the type bar might take place.

In the second construction, it will be noted, the inner set of balls, the function whereof is to take the stresses incident to the oscillatory motion of the type bar, is slightly farther from the center of motion than in the first construction, while the outer set of balls of this last named construction, the function of which balls is to take the lateral stresses, are replaced by the circular track way 28 which serves the same purpose.

In both of the constructions above described the pivot nut, which may be regarded as one of the hanger parts, is maintained properly spaced apart from the other hanger part by means of the head of the securing screw and a series of anti-friction balls, the arrangement being such that if these balls were removed the two parts of thehanger would be free to collapse or fall toward each other. Because of this con struction it is possible to adjust. my improved type bar and hanger by a single operation, said operation merely consisting in turning the securing screw which cooperates with the pivot nut.

Various other changes may be made without departing from the spirit of my invention.

hat I claim as new and desire to secure by Letters Patent, is

1. The combination of a type bar hanger, a type bar, a rotatable pivot nut slidably connected with said hanger, a screw assisting to maintain the nut in a fixed relation with the hanger, said sci-cw having its axis coincident with the axis of rotation of the type bar, and anti-friction balls interposed between the pivot nut and the type bar and also assisting to maintain said nut in a fixed relation with the hanger.

2. The combination of a two-piece hanger, a type bar interposed between the two. pieces of the hanger, an independent screw securing the two pieces loosely together, said screw passing through the center of motion of the type bar and abutting against one part of the hanger, thereby preventing the two hanger parts from separating, and a plurality of anti-friction balls. which prevent the two hanger parts from collapsing or falling together.

3.. The combination of a two=piece hanger, a type bar interposed between the two pieces of the hanger, an independent screw securing the two pieces loosely together, and a set of anti-friction balls co-acting directly with one of said hanger pieces, said balls serving as a bearing for said type bar and also preventing the two pieces of the hanger from collapsing or falling together.

4 The combination of a type bar hanger,

a type bar, a rotatable pivot nut slidably connected with said hanger, a connecting screw having its axis coincident with the axis of rotation of the type bar, a set of anti-friction balls interposed between the pivot nut and the type bar, said anti-friction balls and said screw cooperating with the type bar to maintain the type bar hanger and the pivot nut in a fixed relation.

5. The combination of a type bar hanger, a type bar, a rotatable pivot nut slidably connected with said hanger, a connecting screw having its axis coincident with the axis of rotation of the type bar, a set of anti-friction balls interposed between the pivot nut and the type. bar, said anti-friction balls and said screw cooperating with the type bar to maintain the type bar hanger and the pivotnut in a fixed relation, and another set of anti-friction balls between the type bar and the hanger.

6. The combination of a type bar hanger, a type bar, a rotatable pivot nut slidably connected with said hanger, a connecting screw having its axis coincident with the axis of rotation of the type bar, a set of antifriction balls interposed between the pivot nut and the type bar, said anti-friction balls and said screw cooperating with the type bar to maintain the type bar hanger and the pivot nut in a fixed relation, and another set of anti-friction balls between the type bar and the hanger, said last set being seated in a ball race in said hanger and farther from the center of motion than the first set of balls.

7. The combination of a two-piece type bar hanger, a type bar interposed between the two pieces of the hanger, a screw securing the two pieces loosely together and lying in the axis about which the type bar turns, a set of anti-friction balls co-acting with said type bar and with one of the hanger pieces and cooperating with said last mentioned piece and with the type bar to maintain the two pieces of the hanger properly spaced apart, and another set of anti-friction balls cooperatin with said type bar and with the other of t e hanger pieces.

8. The combination of a type bar, a two: part hanger, one hanger part fitting adjustably in the other part, a screw securing the two hanger parts slidably together, the axis of said screw being coincident with the axis of rotation of the type bar, one of said parts being recessed to receive the type bar and the type bar being recessed to receive the other of said parts, a set of anti-friction balls interposed between the last named hanger part and the type bar and both serving as a bearing for the type bar and also asslsting in maintaining the two hanger parts properly spaced apart, and a second set of antifriction balls between said type bar and one of said hanger parts, said second set of balls being farther from the center of motion than the first set and assisting to take lateral stresses to which the type bar is subjected.

9. The combination of a type bar, a hanger part, a plurality of anti-friction balls, a screw and a nut cooperating therewith, which nut serves as the sole pivotal support for said balls, as a cover plate for said balls, and as a means for maintaining the relation between the type bar and hanger.

10. The combination of a type bar hanger, a type bar, and a plurality of sets of antifriction balls co-acting with said type bar and hanger, the hanger and type bar parts being so interseated that a plane passed through the exposed joint between them and parallel to the plane of rotation of the type bar intersects one of said parts and one of said sets of anti-friction balls, said plane intersecting the part before intersecting any of the balls.

11. In a typewriting machine, the combination of a type bar hanger, a type bar, and anti-friction balls between said hanger and said type bar, one of the type bar and hanger parts having a flange disposed transversely of the exposed joint between said parts, said flange crossing the joint and forming a bottom for said joint and covering said balls.

Signed at Syracuse, in the county of Onondaga, and State of New York, this fifteenth day of October A. D. 1904.

JOHN A. EDLUND.

'Witnesses:

GEO. WV. DIOHERMAN, SILAs W. CRANDALL. 

